noun
false killer whale
A species of dolphin (Pseudorca crassidens) resembling the killer whale. The name is a biological term, but it may appear in nature documentaries or marine life contexts.
オキゴンドウは、シャチに似た姿をしているが、別の種類のイルカだ。
The false killer whale looks similar to the killer whale, but it is a different species of dolphin.
シャチ (killer whale) is a larger, more well-known black-and-white dolphin species, while オキゴンドウ is a smaller, uniformly dark dolphin often confused with it.
The name オキゴンドウ is a combination of 沖 (offshore) and 巨頭 (large head), referring to its offshore habitat and rounded head shape. The exact historical derivation is uncertain.